It's a serious question.
On the surface, it seems like it may produce as boring of a conversation as "What did you learn at school today?" would with a disinterested middle-schooler.
Dig a little deeper and you'll identify several bullet points that can bring the conversation to a close.
Find a shovel, spend fifteen minutes digging, and you may realize your entire day was spent learning. Learning about new problems (and consequently a new project) and new elements of old problems (why that project is delayed), about how to get work done (it's a Zoom revolution), about the people you work with, about the social norms of the organization (everyone is always arriving late to meetings), about what's working and what isn't (data!), about yourself, and an endless list of additional topics ... and then of course learning about what to do with all of it.
That's what work is: learning ... and then doing something with the lesson, often a tiny adjustment and occasionally something Very Big.
What did you learn at work today?
Ten or so questions which ask "What did you learn at work today?" in different ways:
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